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S. EISTERHOLD.

TWO-SPEED MECHANISM.

APPLICATION FILED APR. 9, Isls.

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4/ www s. EISTERHOLD.. TWO-SPEED MECHANISM.

, APPLICATION HLED APR. 9. 193. 1 ,3 1 6,564. Patented Sept. 23, 1919.

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SEBASTIAN nisrEianoLn, or nien FOUNTAIN, iviIssoURI;`

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To all whom t may concern.' j Be it known that I, SEBASTIAN EISTER- HOLD, a citizen of the United States, residing at Rich Fountain, in thecounty of Osage, State of Missouri, have invented cer1 tain new and useful Improvements in Two- Speed Mechanisms; and I do hereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to `which it appertains Vto make and use the same. j

This invention is an improvement in transmission gearing and has particular reference to a two speed mechanism adapted `for use on motorcycles.

An object of the invention is to provide an improved mechanism wherein the Y. use of shiftable gears `is dispensed with when changing speed and the consequent danger `of the stripping of gears thereby avoided.

Another object is the provision of a mech anism wherein a drive pulley is. operated directly from the crank shaft of an engine by a train ofgearing and indirectly by said gearing and clutch elements associated therewith.

`A further object is to provide novel means for adjusting one of the clutch elements into and out of engagement with ass0- cited elements.

A still further object is to provide a mech` anism of this character which is simple in construction, comparatively easy to manufacture and effective in carrying out the purpose for which it is designed.

` The inventive idea involved is capable of receiving a variety of mechanical expres-- sions one of which, for the purpose of illustrating the invention, is shown in the accompanying drawings wherein Figure 1 is a longitudinal sectional view through the mechanism.

Fig. 2 is afsection on the line 2-2 of l. Fig. 3 is a section on the line `3 3 `of Fig. j

Fig. 4 is asection on the line 4 4 of Fig.`1 looking inthe direction of the arrows.

Eig. 5 is a section ion the same line looking in the opposite direction.

Fig. 6 is a perspectivervi'ew of a drum employed in connection with the invention.l

Specicaton of Letters Patent. Patented Sept. 23, 1919. Application filed April 9, 1918. Serial No. 227,509; Y

Fig. 7 is a similar `view of one of the clutch shifting members carried by the drum.

Fig. 8 is a similar view of one of the gears of the train of gearing.

The invention is particularly designed for use in connection with engines employed on motorcycles but it will, of course, be understood that the same may be used on other motor driven vehicles as well. In the drawings, the numeral 10 indicates the crank shaft ofan explosive engine one end of which projects through the crank case 11 and itis with this end of the shaft that the mechanism which comprises the essential feature of this invention is associated.

The mechanism preferably comprises a central gear 12 `secured to the shaft 10 by 1sameso that rotation of said gear 12 will be imparted to the gears 19 when the shaft 10 Ais driven. Also mounted within the recess 17 is a large internal gear 20 the Hange 21 of which encircles the gears 19 and said iange is provided with the internal teeth 22 which engage the teeth of said gears 19. The gear 20 has a bearing directly upon the crank shaft 10 and is provided with an annularconcentric'shoulder 28 engaged by the inner periphery of a` clutch ring 24 which is secured `to the adjacent face of the pulley7 16 by means of suitable fasteners or screws 25 and therouter periphery of said clutch .member or ring extends slightlybeyond that of the pulley 16 for a purpose which will appear in the course of the description.

` A brake drum 26 is alsorotatably mounted upon the crank shaft 10 and is secured to the gear 20V` by means of bolts or other fasteners 27 which extend through said gear and drum and also through a brake band retaining plate `2&3 of, a greater diameter than the drum and in this manner the gear 2O and .drum 26 will operate in unison. Supported upon the inner side of the drum 26 and movable laterally relative thereto is a second clutch ring or member 29 adapt` ed to be shifted in a manner -to presently pear, into and out of engagement with the clutch member 24 and when in engagement therewith it will be apparent that the pulley- 16 .will lbejdrivenor rotated through the intermediary of the gears 19 and 2O and the drum 26 and the clutch members. For the purpose of shifting the clutch ymember 29 laterally Awith respect to the drum ...15d

and into engagement with the clutch member 24, lthe drum 26 is provided in a peri'phery with a plurality of recesses 30, pref- '.erably three in number, and one end of each recess is reduced or cut away to provide the shoulder 31 while the other end ofl the recess is provided with a slot or guide groove 32 arranged diagonally with respect to a plane of the drum for a purpose which will presently appear. The sioulder 31 is prolvided. with an opening 33 for receiving the vpivot stud 34 extending laterally from the reduced end 35 of a laterally movable clutch shifting Vmember 36 of arcuate formation Lso as to conform substantially to lthe contour of the peripheryof the drum when the mem- ,ber is in one of its adjusted positions and lsaid reduced end 3,5 is provided upon its inner face with oppositely .disposed cam surfaces v37 which coperate with similar surfaces 38 formed upon the adjacent face of will be moved laterally with respect to the `drum whensaid member is adjusted about its pivot 34.

The end vof the member 36 opposite the end 35 is provided with a rib 39 arranged diagonally with yrespect to said end engagable in the groove 32 so as to guide said member .36 in its lateral `movements and controlled, theresis preferably provided a alsov=prevent accidental Ldetachment of the member from 1the drum. rlhe inner periphery of kthe member 36 is provided with a pair of strong coil springs 40 which engage .in sockets 41 formed upon the bottom of the recess 30 and said springs normally have ythe tendency to force the free end of the member 36 outwardly in o rder that the `clutch member 29 will be engaged with the member 24.

In :order that the rotation of the ,drum 26 and .positions of the members 36 may be brake band 42 encircling the periphery `o f thedrum and members 36 and positioned between tjhe clutch member 24 and retain ing plate 23, said member and plate being adapted to prevent accidental .detachment of the bandffrom lthe ydrum and it is for the purpose that the `clutch member 24 has its -v outervfedge extending beyond the .outer pe riphery of the pulley 16 so that said band will be prevented from engaging said pulley. Theends of the band 42 are connected to links 43 which are in turn connected to an operating lever 44 which is disposed within easy reach of the operator of the vehicle so 4that said lever may `be adjusted to eX- pand and contract the band 42 about the vthe drum 26 is prevented from rotating and owing to the fasteners 27, it will be apparent that the internal gear 20 will also be prevented from rotating. Thus when the fcrank shaft 10 lis operated, the gears 12 rotating the gears 19, will vcause the latter to j travel planetarily within the internal gear 120 by reason of the engagement of said gears 19 with the teeth 22 and this travel of the gears 19 will carry the pulley 16 therewith ithus imparting to the same a slow speed. ,In vorder to secure a second or high speed, the lever 44 is operated in the opposite direction to loosen the band 42 about the drumv `26 and members 36 whereupon ithe latter will move outwardly under the action o1 vthe'springs 40 and owing to the construction of the ends 35 of said members and the formation of the slots 32 and ribs 39, said members will also move laterally toward y Athe ,f g'ea-r 20 until the clutch members 24 and the 'shoulderN 31 whereby said member 36 ing of the band 42 will Vtherefore serve the -dual purpose of permitting rotation of the 29 are in clutching engagement. The loosendrum 2,6 and imparting the `movement thereclutching member `24 with a consequent rincreased speed of said pulley.

That is claimed is z- 1. A two speed transmission comprising,

f in combination with a shaft, a pulley rotal,tableaboutsaid shaft, gearing between the `pulley andshaf-t, a drum rotatable with re= A4spect to the pulley and to which rotation is 'imparted by said gearing, clutching ele- `ments associated with said pulley and drum,

and means carried by said drum and oper Vable to adjust one of the .clutching elements linto engagement with the other whereby to rotate said pulley with the drum at a cer- -tain speed.

2. A two speed transmission comprising, in combination with a shaft, a pulley rotatable about said shaft, gearing between the pulley and shaft, a drum rotatable with respe'ct to the pulley and to which rotation is imparted by said gear-ing, clutching ele ments associated with -said'pulley yand drum,

means `carried :by said drum and operable to adjust' one of the clutching elements into engagement with the other whereby to rotate said Vpulley with the drum ata certain speed, and braking means associatedwith said drum for throwing sa-id' clutching elements out of .operative engagementfand `stopping rotation ofsaid .drum and: a-'por- Ltion of said gearingwhereby the other portion thereof and said `pulley will rotaterela- `tive to the ffirst named portion'to produce asecond speed. Y Y i. Y v

Y3. A two speed transmission comprising, in combinationwith a shaft, a pulley rotatable about said shaft, gearing between the pulley and shaft,\a drum rotatable with respect-to the pulley and to which rotation is imparted by said gearing,clutching elements associated withlsaid pulley anddrum, and spring controlled `members' pivoted i .to said drum and Aoperable `to adjust saidjclutching elementsinto engagement with -each other whereby to rotate-said pulley with thedrurn ata certain speed. Y n

4. A two speed transmission comprising, in combination with a shaft, `-a pulley rotatable about said shaft, gearing between the pulley and shaft, `a drum rotatable withlie spect to the pulley and to which rotation is imparted by said gearing, clutching elements associatedwith said pulley and drum, spring controlled members pivoted to said drum and operable to adjust said clutching elements into engagement with each other whereby to rotate said pulley with the drum at a certain speed, and braking means associated with said drum for throwing the clutching elements out of operative engagement and stopping rotation of said drum and a portion of said gearing whereby the other portion thereof and said pulley will rotate relative to the first named portion to produce a secondspeed.

5. A two speed transmission comprising, in combination with a shaft, -a pulley rotatable about said shaft, gearing between the pulley and shaft, a drum to which rotation is imparted by said gearing, clutching elements associated with the pulley and drum, and means Cpivoted to said drum and movable laterally with respect thereto for adjusting said clutching elements into engagement whereby to rotate the pulley at a certain speed.

6. A two speed transmission comprising, in'combination with a shaft, a pulley rotatable about said shaft, gearing between the pulley and shaft, a drum to which rotation is imparted by said gearing, clutching ele-V ments associated with the pulley and drum, means pivoted to said drum and movable laterally with respect thereto for adjusting said clutching elements into engagement whereby to rotate the pulley at a certain speed, and means for adjusting the last namedV means to render said clutching elements inoperative and also stop the rotation of .said drum and one of the -gears of said-gearing whereby the remaining gears and said lpulley will rotate relative to the first named gear. i

. 7. :A two speed transmission comprising,

`in combination with a shaft, a pulley rotatable about said shaft, a central gear secured to said shaft, a plurality of planetary gears rotatably supported by said pulley andengaging the central gear, and internal toothed gear engaging said planetary gears, a drum` secured to and rotatable with said internal gear, clutching elements associated with pulley and drum, and means carried by` said `drum and operable to adjust one of the lto said shaft,` a Vplurality of -planetary gears rotatably supported by said pulley. and

engaging `the central gear, 1 an internal toothed gear engaging said planetary gears, aldrum secured toand rotatablefwith said internal gear, clutching elements associated Vin combination with a shaft, a pulley rotatable about said shaft, a central gear secured to said shaft, a plurality of planetary gears rotatably supported by said pulley and engaging the central gear, an internal toothed gear engaging said planetary gears, a drum secured to and rotatable with said internal gear, clutching elements associated with the pulley and drum, means carried by said drum and operable to adjust one of the clutching elements into engagement with the other whereby to rotate said pulley at a certain speed, and means for adjusting the last named means to throw said clutching elements out of operative engagement and to stop rotation of said drum and said internal gear whereby the planetary gears and said pulley will rotate relative to said internal gear and thereby produce a second speed.

10. A two speed transmission comprising, in combination with a shaft, a pulley rotatable about said shaft, a central gear secured to said shaft, a plurality of planetary gears rotatably supported by said pulley and engaging the central gear, an internal toothed gear engaging said planetary gears, a drum secured to and rotatable with said internal gear, clutching elements associated with the pulley and drum, spring controlled members pivoted to said drum and operable to adjust said clutching elements into engagement with each other whereby to rotate said pulley at a certain Speed, and means for ad- .justing said spring controlled members to throw said clutching elements out of. operative engagement and stop-rotation of said drum and said internal gear whereby the planetary gears and pulley will rotate relative to the' internal gear toproduce a second speed.`

11. A two speed transmission comprising,

.in combination with a shaft, a pulley rotatable about said shaft, a central gear secured lto said shaft,v a plurality of planetary gears into engagement with respect to each other whereby to rotate said pulley at a certain speed.

12. A two speed transmission comprising,

Copies of this patent may be obtained for in combination with a shaft, a pulley rotaengaging the periphery of said drinn and@ the clutch element adjusting means for operation of the latter for disengagement of the clutch elements and to stop the rotation ofthe drum and a portion-of said gearino whereby the other portion thereof and saic pulley will rotate relative to the first named portionto producea second speed.

-In testimony whereof, I aiiiX my signature, in the presence, of two witnesses. v SEBASTIAN EISTERHOLD. Witnesses:

FRANKFIGK, JOSEPH EISTERHOLD.

ve cents each, by addressing the Commissioner of Patents, Washington, D. C. l i 

